As num cpus * 1000 is NOT a sensible rlimit, we need to calculate a
more accurate rlimit.
The number of open files is directly dependent on the cpu count and on
the number of trace points per cpu. A additional constant works as a
buffer for files that are needed by python or do get opened when the
script runs.
Hence we have:
cpus * traces + constant
Reviewed-by: Jason J. Herne <[email protected]>
Signed-off-by: Janosch Frank <[email protected]>
---
scripts/kvm/kvm_stat | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat
index 457624d..93b5ea7 100755
--- a/scripts/kvm/kvm_stat
+++ b/scripts/kvm/kvm_stat
@@ -395,8 +395,15 @@ class TracepointProvider(object):
def _setup(self, _fields):
self._fields = _fields
cpus = self._online_cpus()
- nfiles = len(cpus) * 1000
- resource.setrlimit(resource.RLIMIT_NOFILE, (nfiles, nfiles))
+
+ # The constant is needed as a buffer for python libs, std
+ # streams and other files that the script opens.
+ rlimit = len(cpus) * len(_fields) + 50
+ try:
+ resource.setrlimit(resource.RLIMIT_NOFILE, (rlimit, rlimit))
+ except ValueError:
+ sys.exit("NOFILE rlimit could not be raised to {0}".format(rlimit))
+
events = []
self.group_leaders = []
for cpu in cpus:
--
2.3.0
